Preparation of solid state bromide sensor on the silver surface obtained by nano silver ink printing

Tema ovog rada je izvedba planarne Ag|AgBr elektrode na površini srebrne elektrode dobivene ispisom tintnim pisačem, a koja će služiti kao senzor za mjerenje bromida u vodenoj otopini. Čestice nanosrebra ink-jet printerom nanesene su na fleksibilnu polimernu podlogu. Tako pripremljena elektroda modificirana je kemijski, otopinom FeBr3, kao i elektrokemijski, cikličkom voltametrijom odnosno potenciostatski. Kao rezultat modifikacije nastao je sloj srebrovog bromida na površini elektrode. Potenciometrijskom metodom provedeno je ispitivanje dobivene elektrode u neprotočnim ćelijama u nizu standardnih otopina kalijeva bromida sa i bez podešene ionske jakosti. Ionska jakost podešena je otopinama Na2SO4, NaNO3 i NaAc. Također je provedena elektrokemijska modifikacija i ispitivanje Ag disk elektrode, a dobiveni rezultati uspoređeni su s rezultatima dobivenim mjerenjima pomoću nanosrebrom ispisane elektrode. Najbolje odzive pokazala je nanotintom ispisana elektroda dobivena modifikacijom sa željezovim(III) bromidom te potenciostatski modificirana disk elektroda. Općenito, bolja osjetljivost je dobivena koristeći printanu elektrodu. Ako promatramo samo elektrokemijsku vrstu modifikacije, možemo zaključiti da je potenciostatska metoda bolji odabir modificiranja metalne površine.In this work, an all-solid-state Ag|AgBr electrode was successfully fabricated on the surface of a planar silver electrode imprinted with an ink-jet printer. In the printing process nanoscale silver particles were applied to a flexible polymeric substrate. The electrode thus prepared was modified chemically using FeBr3 solution, and electrochemically, by cyclic voltammetry and at fixed potential. As a result of the modification, a thin layer of silver bromide was formed on the surface of the electrode. In order to test the electrode, potentiometric measurements were performed in a series of standard potassium bromide solutions with and without the adjusted ionic strength. Adjusting the ionic strength was achieved using 50 mM Na2SO4, NaNO3 and NaCH3COO solutions. Electrochemical modification and examination of the Ag disc electrode were also performed. Finally, collected results were compared to the results of the printed electrode measurements. The best response was given by the printed electrode whose surface was modified using ferric bromide and disc electrode modified potentiostatically. Generally, better sensitivity (higher slopes) was obtained using a printed electrode. If we observe only the electrochemical type of modification, we can conclude that the potentiostatic method is a better choice for modifying the metal surface